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发明名称
摘要
申请公布号
JPH0254894(U)
申请公布日期
1990.04.20
申请号
JP19880133791U
申请日期
1988.10.13
申请人
发明人
分类号
E21D11/00;E21D11/08;(IPC1-7):E21D11/00
主分类号
E21D11/00
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